Rotary pump.



- F. C. RO-OD.

RQTARY PUMP. APPLICATION FILED JULY 20, 19M.

Patented Spt. 18,

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FLETCHER C. HOOD, OF PCBTLAND, QBJEGON.

ROTARY PUMP.

Specification of Letters Patent.

Patented Sept. 18,1917.

Application filed July 20, 1914. SeriaI No. 851,925

struction in which each of the rotary impellers alternately rotates ahalf revolution and then stands still while a companion impeller rotatesa half revolution, said impellers thus operating at all times to form apartition or division across said casing chamber, with one portion ofthe chamber serving as an inlet or receiving chamber, and the otherportion thereof as a discharging chamber. Thus by making possible thisintermittent revolution of the impeller and alternating them, thechamber within the casing is divided at all times into twononcommunicating chambers, one of which is a receiving chamber and theother is a discharging chamber.

In order that others may understand my invention, 1 have shown onepractical embodiment thereof in the accompanying sheet of drawings,which will now describe.

Figure 1 is a top plan view of one form of the invention with a portionof the casing broken away and parts shown in section;

Fig. 2 is an end view thereof showingv one kind of gearing connectionwith which 1 am able to accomplish the alternate intermittent movementsof the impellers or vanes;

Fig. 3 is a sectional view taken on line 33 of Fig. 1, showing theinside arrangement of the impellers, and also the inlet and exhaustports; and

Figs. 4: and 5 show one pair of the cooperating intermittent gears foreifecting the alternate intermittent drive of the impeller.

Referring now to the drawings, 1 designates a casing, here shown ofelliptical form in cross section, with inlet and discharge ports, as 2and 3. Mounted within said casing are two impellers 4 and 5, shown moreclearly as to their form and cooperative arrangement in Fig. 3, whichshows the end view thereof. Certain of the outer portions or edges theseimpellers are shown rounded, as at r and 5, while other portionsthereof, as from the bul e or middle to the end shown straight, as at land 5 said surfaces being shaped so as to give the best bearingengagement thereetween in their rotative movements. Thus assuming thatimpeller 5 is standing still in the crosswise'position shown inFig. 3,and that impeller i is revolving in the direction indicated by thearrow, as soon as impeller reaches the position shown in dotted lines,its bearing surface at l nearest its shaft, engages the rounded outersurface 5 of impeller 5, with the greatest leverage, and gives toimpeller 5 an initial movement, which is continued by the gearconnection hereinafter again referred to. The impeller a then assumes acrosswise position and stands still until the oppositeend of theimpeller 5 makes a half revolution and gives to it a starting movement,which is continued by the gear connection, which I will nowdescribe.

Each of the impellers at and 5 is provided upon its carrying shaft,outside the casing 1, with anintermittent gear member, as 6 and 7,respectively, adapted to .m'esh, respectively, with two intermittentdriving gears, as 8 and 9, mounted upon a driving shaft 10, which may bedriven by hand, as with a crank 11, or by any power mechanism desired.

The intermittent gears 6 and 7, mounted upon the impeller shafts areprovided at their opposite sides with smooth concaved portions, 6 and 7,instead of a continuation of their teeth, while the gears 8 and 9 areprovided with teeth only for a portion of their circumference and areleft full or solid in conical form for the balance thereof, as at8 andAssuming that shaft 10 is being revolved and-with it gears 8 and 9, thetoothed portion of the gear 8 is in mesh with the toothed portion of thegear 6 and is therefore driving gear 6 and its impeller 4, while a solidportion of gear 9 is turning in one of the concaved portions 7 in gear7, thus leaving gear 7 and its impeller astanding still. Under thisaction, impeller 4 moves to the position shown in dotted lines, Fig. 3,where it engages impeller 5 and imparts to it an initial movementwhichoperates to turn its gear 7 sufficiently to bring its teeth into meshwith atoothed portion of the gear 9, which has reached that point, whichconnection continues the movement of the impeller In the meantime theconcaved portion 6' of gear 6 and the solid portion 8 of gear 8 havemoved together, leaving gear 6 and its impeller at standing in acrosswise position until impeller 5 makes another half revolution andits opposite end engages impeller at and gives to it an initial movementsufiicient to move its gear 6 again into driving engagement with thetoothed portion of gear 8. Thus by revolving shaft 10 and the gears 8and 9 continuously, the gears 6 and 7 are given alternately a halfrevolution, and impart the same movement to the impellers or vanes l and5, which operate to cause an inrush of fluid through inlet 2, and toforce it out through discharge port 3, in a manner well understood.

I am aware that slight changes can be made in the embodiment of myinvention here shown for purposes of illustration without departing fromthe spirit thereof, and that different driving connections can be usedto impart the alternate intermittent movement to the impellers, and I donot, therefore limit myself to the form here shown, except as I may belimited by a broad interpretation of the hereto appended claims.

I claim;-

1. In a rotary pump, a casing with inlet and discharge ports, rotaryimpellers mounted to revolve upon independent parallel shafts s acedapart therein, and means for driving said impellers with an intermittentand alternating movement, said impellers being adapted to have a rollingcontact with each other as they come together.

2. In a rotary piunp, a casing provided with inlet and discharge ports,two rotary impellers having convened faces and mounted to turn aboutparallel axes within said casing, and driving connections adapted todrive said impellers alternately for a portion of a full revolution at atime.

3. In a rotary pump, a casing having inlet and exhaust ports, rotaryimpellers mounted upon spaced parallel shafts therein in cooperativerelationship with each other, a drivin member adapted to be continuouslydriven, and intermittent driving connections from said driving member tosaid impellers designed to alternately drive them a portion of arevolution at a time, said impellers having rounded contacting faces andadapted to have intermittent rolling engagement with each other, for thepurpose specified.

It. A rotary pump of the character referred to comprising incombination, a casing provided with inlet and discharge ports, twocooperating impellers 'rotatably mounted to turn about parallel, spacedaxes therein and adapted to have a rolling bearing engagement one withthe other, a driving member adapted to be continuously driven,

and intermittent drivin connections from' said member to said impellersadapted to alternately drive them for a portion of a revolution only atone time.

5. In a rotary pump, the combination with the casing and the cooperatingimpellers revolubly mounted therein, of a driving mechanism comprising acontinuously driven member, and intermittent gear members connectingsaid impellers with said driven member and arranged to impartalternately to said impellers a part of afull revolution, each impellerbeing adapted to give to the other an initial movement to put its gearmembers into action.

6. In a rotary pump, the combination of a casing provided with inlet anddischarge openings, two rotary impellers mounted therein in cooperatingrelationship with each other, a driving shaft, intermittent gear membersmounted on said shaft and intermittent gear members mounted on saidimpellers, said gears being connected with each other in pairs and saidpairs being adjusted to alternately and intermittently drive saidimpellers for a portion of a revolution at a time, one impeller beingadapted to engage and impart an initial movement, to the other,substantially as described.

Signed at Portland, ltIultnomah county, Oregon, this 14th day of July,1914.

FLETCHER G. vROOD.

In presence of:

F. E. LITZENBERG, CLYDE Evans.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents; Washington, D. G.

